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The patterns of movement followed by the nodes in an ad-hoc network play an important role in the performance of routing protocols. These different patterns of movement of the nodes can be classified into different mobility models, each of which are characterized by their own distinctive features. We have explored the influence of three such mobility models (Pursue, Column and RPGM-RW) on the performance of three well-known ad-hoc routing protocols namely DSR, AODV and DSDV. The simulation environment used for this purpose was NS-2. The significance of this study lies in the fact that there has been very limited investigation of the effect of mobility models on routing protocol performance in ad-hoc networks.